He feels an open summons and lets it grab him -
"It's a difficult situation and I'm honestly not sure how to proceed," says Jarvis. "But it's possible that this information might be relevant to your safety, so... While Sherlock was in New York, he discovered that Tony's parents - previously assumed to have died in an ordinary vehicular accident - were assassinated by a family friend. Tony is not taking it well."
"He is currently well supplied in that area, but I will make sure he knows that you offered."
Cam has less trouble feeding himself. He finishes his sugar glass, then says, "Hey, Jarvis? In the interest of not getting crumbs or unnecessary plates all over the place if I make myself anything more substantial to nibble on, can you direct me to someplace that has dishes already?"
The elevator doors are open when he gets there; Jarvis lets him off on the ground floor, then says, "End of the hall to your right."
There are many types of bowls in that cupboard over there! Also chairs at the kitchen table, if he would like to sit down while he soups.
He gets a bowl, and now it is full of tomato soup and a triangle of grilled cheese sandwich with no crust, and he sits down and dunks the sandwich in the soup contently.
Eventually he's done with soup and sandwich both and makes himself a cupcake and finishes that too. "What's policy on bowls?" he asks, picking up the bowl.
"In the sink, please. I also have some unfortunate news to deliver. While Sherlock was in New York, he discovered that the car crash that killed Tony's parents was engineered by a family friend. Tony is not handling the news well; you might not see much of him today."
"Sherlock is still likely to want to meet with you later; I'll let you know when he asks."
"Sure. I'll just go continue fleshing out my to-do list, shall I?" Back to the lift he goes.
Cam to-do-lists. He opens the window and makes another batch of bees to break up the monotony. He asks Jarvis the occasional question about whether and how magic has interacted with the suspiciously matchy history of this world.
"Sherlock would like to speak with you now. Shall I tell him to come down?"
Cam puts his computer in standby and stretches. He's going to want to go out some night and fly around, he thinks, but nothing urgent.